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That said, indeed Valve has opted not to do this with Steam right now.
Learn more about Steam Points here:
https://store.steampowered.com/points/howitworks
Easy answer. You don't.
https://store.steampowered.com/points/shop/
Terrible idea they were.
You do not to make a purchase to get Steam points.
https://store.steampowered.com/points/howitworks
You can also get Steam Points if someone from the community grants an award to one of your user reviews or other uploaded content such as screenshots, videos, guides, or Workshop items.